Mercurial > gnulib
annotate lib/pt_chown.c @ 17363:5a51fb7777a9
sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin
Problem reported by Marco Atzeri in
<http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>.
* lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]:
Simply delegate to the system <sys/select.h> in this case too.
Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only
if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to
be needed on Solaris either.
* lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]:
Simply delgate to the system <sys/time.h> in this case.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Tue, 19 Mar 2013 09:08:47 -0700 |
| parents | e542fd46ad6f |
| children | 344018b6e5d7 |
| rev | line source |
|---|---|
|
16235
18a38c9615f0
In commentary, do not use ` to quote.
Paul Eggert <eggert@cs.ucla.edu>
parents:
16201
diff
changeset
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1 /* pt_chown - helper program for 'grantpt'. |
|
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maint: update all copyright year number ranges
Eric Blake <eblake@redhat.com>
parents:
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diff
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2 Copyright (C) 1998-1999, 2009-2013 Free Software Foundation, Inc. |
| 13027 | 3 Contributed by C. Scott Ananian <cananian@alumni.princeton.edu>, 1998. |
| 4 | |
| 5 This program is free software: you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 3 of the License, or | |
| 8 (at your option) any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ | |
| 17 | |
| 18 #include <config.h> | |
| 19 | |
| 20 #include <errno.h> | |
| 21 #include <grp.h> | |
| 22 #include <stdio.h> | |
| 23 #include <stdlib.h> | |
| 24 #include <string.h> | |
| 25 #include <sys/stat.h> | |
| 26 #include <unistd.h> | |
| 27 | |
| 16951 | 28 #include "root-uid.h" |
| 29 | |
| 13027 | 30 #include "pty-private.h" |
| 31 | |
| 32 /* For security reasons, we try to minimize the dependencies on libraries | |
| 33 outside libc. This means, in particular: | |
| 34 - No use of gettext(), since it's usually implemented in libintl. | |
| 35 - No use of error() or argp, since they rely on gettext by default. */ | |
| 36 | |
| 37 | |
| 38 static int | |
| 39 do_pt_chown (void) | |
| 40 { | |
| 41 char *pty; | |
| 42 struct stat st; | |
| 43 struct group *p; | |
| 44 gid_t gid; | |
| 45 | |
| 46 /* Check that PTY_FILENO is a valid master pseudo terminal. */ | |
| 47 pty = ptsname (PTY_FILENO); | |
| 48 if (pty == NULL) | |
| 49 return errno == EBADF ? FAIL_EBADF : FAIL_EINVAL; | |
| 50 | |
| 51 /* Check that the returned slave pseudo terminal is a | |
| 52 character device. */ | |
| 53 if (stat (pty, &st) < 0 || !S_ISCHR (st.st_mode)) | |
| 54 return FAIL_EINVAL; | |
| 55 | |
|
16235
18a38c9615f0
In commentary, do not use ` to quote.
Paul Eggert <eggert@cs.ucla.edu>
parents:
16201
diff
changeset
|
56 /* Get the group ID of the special 'tty' group. */ |
| 13027 | 57 p = getgrnam (TTY_GROUP); |
| 58 gid = p ? p->gr_gid : getgid (); | |
| 59 | |
| 60 /* Set the owner to the real user ID, and the group to that special | |
| 61 group ID. */ | |
| 62 if (st.st_gid != gid && chown (pty, getuid (), gid) < 0) | |
| 63 return FAIL_EACCES; | |
| 64 | |
| 65 /* Set the permission mode to readable and writable by the owner, | |
| 66 and writable by the group. */ | |
| 67 if ((st.st_mode & (S_IRWXU|S_IRWXG|S_IRWXO)) != (S_IRUSR|S_IWUSR|S_IWGRP) | |
| 68 && chmod (pty, S_IRUSR|S_IWUSR|S_IWGRP) < 0) | |
| 69 return FAIL_EACCES; | |
| 70 | |
| 71 return 0; | |
| 72 } | |
| 73 | |
| 74 | |
| 75 int | |
| 76 main (int argc, char *argv[]) | |
| 77 { | |
| 78 uid_t euid = geteuid (); | |
| 79 | |
| 16951 | 80 if (argc == 1 && euid == ROOT_UID) |
| 13027 | 81 { |
| 82 /* Normal invocation of this program is with no arguments and | |
| 83 with privileges. */ | |
| 84 return do_pt_chown (); | |
| 85 } | |
| 86 | |
|
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pt_chown: Don't depend on GPLed modules.
Bruno Haible <bruno@clisp.org>
parents:
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87 /* It would be possible to drop setuid/setgid privileges here. But it is not |
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81c0a49eb40d
pt_chown: Don't depend on GPLed modules.
Bruno Haible <bruno@clisp.org>
parents:
13027
diff
changeset
|
88 really needed, since the code below only calls strcmp and [f]printf. */ |
| 13027 | 89 |
| 90 { | |
| 91 int do_help = 0; | |
| 92 int do_version = 0; | |
| 93 int remaining; | |
| 94 | |
| 95 for (remaining = 1; remaining < argc; remaining++) | |
| 96 { | |
| 97 const char *arg = argv[remaining]; | |
| 98 | |
| 99 if (arg[0] == '-') | |
| 100 { | |
| 101 if (strcmp (arg, "--") == 0) | |
| 102 { | |
| 103 remaining++; | |
| 104 break; | |
| 105 } | |
| 106 else if (strcmp (arg, "--help") == 0) | |
| 107 do_help = 1; | |
| 108 else if (strcmp (arg, "--version") == 0) | |
| 109 do_version = 1; | |
| 110 else | |
| 111 { | |
| 112 fprintf (stderr, "pt_chown: invalid option: %s\n", arg); | |
| 113 return EXIT_FAILURE; | |
| 114 } | |
| 115 } | |
| 116 else | |
| 117 break; | |
| 118 } | |
| 119 | |
| 120 if (remaining < argc) | |
| 121 { | |
| 122 fprintf (stderr, "pt_chown: too many arguments\n"); | |
| 123 return EXIT_FAILURE; | |
| 124 } | |
| 125 | |
| 126 if (do_help) | |
| 127 { | |
| 128 printf ("Usage: pt_chown [OPTION...]\n"); | |
| 129 printf ("Set the owner, group and access permission of the slave pseudo terminal\n" | |
| 130 "corresponding to the master pseudo terminal passed on file descriptor %d.\n" | |
| 131 "This is the helper program for the 'grantpt' function. It is not intended\n" | |
| 132 "to be run directly from the command line.\n", | |
| 133 PTY_FILENO); | |
| 134 printf ("\n"); | |
| 135 printf (" --help Give this help list\n"); | |
| 136 printf (" --version Print program version\n"); | |
| 137 printf ("\n"); | |
| 138 printf ("The owner is set to the current user, the group is set to '%s', and the\n" | |
| 139 "access permission is set to '%o'.\n", | |
| 140 TTY_GROUP, S_IRUSR|S_IWUSR|S_IWGRP); | |
| 141 printf ("Please report bugs to <bug-gnulib@gnu.org>.\n"); | |
| 142 return EXIT_SUCCESS; | |
| 143 } | |
| 144 | |
| 145 if (do_version) | |
| 146 { | |
| 147 printf ("pt_chown (GNU %s) %s\n", "libc", "2.11"); | |
| 148 printf ("Copyright (C) %s Free Software Foundation, Inc.\n" | |
| 149 "This is free software; see the source for copying conditions. There is NO\n" | |
| 150 "warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.\n", | |
| 151 "1999"); | |
| 152 return EXIT_SUCCESS; | |
| 153 } | |
| 154 } | |
| 155 | |
| 156 /* Check if we are properly installed. */ | |
| 16951 | 157 if (euid != ROOT_UID) |
| 13027 | 158 { |
| 159 fprintf (stderr, "pt_chown: needs to be installed setuid 'root'\n"); | |
| 160 return FAIL_EXEC; | |
| 161 } | |
| 162 | |
| 163 return EXIT_SUCCESS; | |
| 164 } |